Graphical user interface for a display screen or portion thereof



The single FIGURE is a front view of a graphical user interface for adisplay screen or portion thereof showing my new design.

The broken line showing of the display screen or portion thereof is notpart of the claimed design.

The AT&T trademark in the upper left corner of the FIGURE is aregistered trademark of AT&T Intellectual Property II, L.P. Trademarksare the property of their respective owners.

The ornamental design for a graphical user interface for a displayscreen or portion thereof, as shown and described.